MIL-DTL-3883B
TABLE I. Cord types, dimensions and electrical requirements.
Insulation
Outside
resistance at Capacitance
Insulation
Jacket
diameter of Dielectric
15.6°C,
Number of thickness
thickness
Maximum
Cord types
cord,
withstanding
conductors minimum
minimum
(Pf/ft.)
minimum
maximum voltage (rms)
(Inch)
(Inch)
(megohms
(Inch)
1,000 ft.)
WSL-1(20)
1
.015
.015
.165
1,000
500
85
*WSL-1H(20)
1
.040
.025
.255
2,000
1,000
45
WSL-2(20)
2
.015
.032
.290
1,500
500
70
WSL-3(20)
3
.015
.032
.300
1,500
500
80
WSL-4(20)
4
.020
.035
.330
1,500
500
95
WSL-5(20)
5
.020
.040
.390
1,500
500
95
WSL-6(20)
6
.020
.040
.420
1,500
500
95
WSL-7(20)
7
.020
.068
.440
1,500
500
95
*Heavy duty, high voltage application.
3.3 Construction (see 4.5.1). Cords shall be constructed in the following manner. Each conductor
shall be 20 AWG stranded, tinned-coated, copper wire covered with a separator and insulated with
styrene butadiene rubber. (The separator may be omitted if a free-stripping insulating compound is
used). The insulated conductors shall be wound in a left-hand direction using fillers, if necessary, to for a
compact round core. The lay shall be 10 to 16 times the pitch diameter of the cabled conductors. A
closely woven binder or serving shall be applied over the cabled conductors, and a tinned-coated copper
shield applied over the binder or serving. A separator shall be closely wound over the shield and a black
styrene butadiene rubber jacket applied over the separator. The cord ends shall be sealed.
3.4 Materials (see 4.5.1). The materials used in the fabrication of cords shall be as specified herein.
3.4.1 Conductors (see 4.5.1). Conductors shall be 20 AWG, stranded, soft or drawn-and-annealed
tinned-coated copper wire conforming to A-A-59551, type B, class M.
3.4.2 Yarn (see 4.5.1). All yarn used for separators, servings, binders or fillers shall be synthetic fiber
conforming to MIL-C-572, type P or CTA, or polyester yarn. The yarn used shall be clean, dry, and
substantially free from all foreign particles, knots, lumps, or any substance that might impair the insulation
of the wire.
3.4.3 Tape (see 4.5.1). Tape used for separators shall be polyester conforming to MIL-I-631, type G,
form Tf.
3.4.4 Insulation (see 4.5.1). A styrene butadiene rubber insulating compound conforming to MIL-I-
3930, type IS-L, shall be applied over the conductor or separator, when present, to a minimum thickness
as specified in table I. The insulation shall be applied over the conductor or separator, when present, to a
minimum thickness as specified in table I. The insulation shall be capable of being readily stripped from
the conductor by standard methods, leaving the conductor clean for soldering. Insulated conductors shall
be readily separable from each other.
3
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